diff --git a/custom_components/ha_text_ai/const.py b/custom_components/ha_text_ai/const.py
new file mode 100644
index 0000000..18b2b64
--- /dev/null
+++ b/custom_components/ha_text_ai/const.py
@@ -0,0 +1,12 @@
+"""Constants for the HA Text AI Integration."""
+DOMAIN = "ha_text_ai"
+
+CONF_API_KEY = "api_key"
+CONF_API_BASE = "api_base"
+CONF_REQUEST_INTERVAL = "request_interval"
+DEFAULT_API_BASE = "https://api.openai.com/v1"
+DEFAULT_REQUEST_INTERVAL = 2
+
+# Text Helper related
+TEXT_HELPER_MAX_LENGTH = 65536
+TEXT_HELPER_PREFIX = "text_ai_response_"